DU vs allseas

i have a cat 11 booked with DU for mar 4, 2004
i just checked allseas and the same cat is $100 cheaper or for the same price, i can can upgrade to cat 10.

DU does not price match and although they been very nice so far, i don't know if it's worth an $100. i usually do my own ps, and am constantly checking for discounts anyway.
anyone have any suggestions?